“We read with interest your ​statements​ about having more children,” the letter begins.

“Our organisation, ​Having Kids​, promotes a sustainable and child-centered family planning model, and we wanted to offer a few thoughts for your consideration.”

The first iconic picture of the Kate, William and a newborn Prince George (Image: Getty Images)

Anne Green, Having Kids’ executive director, explained that as one of the world’s most famous families, who many other people look up to, Kate and William should lead by example.

By having fewer children, Green says, the Cambridges would be reducing their environmental impact on factors such as climate change, flooding and wildlife extinction.

“All of us – especially public figures – should plan our families with the future environment in mind, producing a smaller and more resilient populace capable of thriving in that environment,” the letter reads.

One more for the roost, as they welcome the newborn Princess of Cambridge (Image: PA)

The letter continues: “Of course, we know that Prince George and Princess Charlotte are certain to have wonderful lives, protected from the deprivation of poverty and the threat of environmental degradation.

“They will receive optimal amounts of care and attention, as well as the best possible education.

“But the same can’t be said of every future child.”

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They are quite cute (Image: Getty Images Europe)

Cheerleaders for the Royal family were outraged.

“You want to mind your own business! Who are you to dictate how many kids our royals, or anyone has?! Butt out!” wrote on incensed Twitter user.

“We only have one child and live in the UK. Will and Kate can have the rest of the quota allocated by you,” another woman kindly offered before adding, “We don’t live in China!”

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Having Kids has since responded to the backlash, explaining they chose William and Kate because of their public stature, and that “the impact the wealthiest families have on the environment dwarfs the impact of children born in the developing world.”